The problem with the stability is that most of these were constructed
using a Galvinised steel rod to set the tuning correct? Try a
replacing it with a more similar metal to copper like brass or copper
threaded rod if you can find it. or a plastic rod that has good
tempreture charecteristics. What would be ideal are some threaded
bushings with set screws and then the rod doesn't need to be threaded.
On 4/15/05, Joe <[EMAIL PROTECTED]> wrote:
>
> I had a set of "sewer pipe" duplexers like what you are describing for
> 220Mhz years ago. I built a wood box, put a small light bulb and a
> thermostat inside and set it to about 90 degrees. These kept them fairly
> stable year-round.
>
> 73, Joe, k1ike
>
> At 07:44 AM 4/15/2005 -0600, you wrote:
> >Not in Indiana, but a comment. I Used one of those Duplexers years ago. Be
> >careful where you locate it. Extremely sensitive to temperature variations.
> >We had it on a mountaintop and retired it after the first winter.
> >Gary - K7NEY
>
>
> Yahoo! Groups Links
>
>
>
>
>
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